LONDON (Reuters) - A blood clot in a person’s vein nearly doubles the risk of heart attack or stroke within a year, a Danish study showed on Friday, providing strong evidence the three conditions are linked.Blood clots in coronary arteries have long been known to be a common cause for heart attacks and strokes, but scientists had largely believed blood clots in veins were unrelated, said Henrik Sorensen, an epidemiologist at Denmark’s Aarhus Hospital.
